<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        body {
            height: 3000px;
        }

        div {
            margin: 100px;
            text-align: center;
            position: sticky;
            top: 10px;
            width: 900px;
            height: 50px;
            color: aliceblue;
            background-color: blue;
        }
    </style>
</head>

<body>
    <div>导航栏</div>
</body>

</html>